stripes
Occurrence number:
025-00-079
Country:
Brazil
Region:
Rio de Janeiro
Location:
Longitude: -42.93, Latitude: -22.82
Carbonatite:
No
A small plug of porphyritic phonolite cuts Tertiary sediments of the Barreiras Formation. Phenocrysts of feldspar, aegirine, nepheline and mica occur and analcime is present in amygdales.
References:
LIMA, P.R.A. dos S. 1976. Geologia dos macicos alcalinos do estado do Rio de Janeiro. Semana de Estudos Geologicos, Itaguai: 205-59
Map:
Fig. 1_204 Distribution of alkaline rocks around Rio de Janeiro.
Location: